SOLUTION: Marla's Grandma is currently 3 times older than Marla, but 25 years from now Marla will be half her Grandma's age. How old is the Grandma right now?

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Question 873383: Marla's Grandma is currently 3 times older than Marla, but 25 years
from now Marla will be half her Grandma's age. How old is the
Grandma right now?
Found 2 solutions by ewatrrr, Alan3354:
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi

(1/2)(3x + 25) = x + 25

    (3/2)x - x = 25 - 12.5

           .5x = 13.5

             x = 13.5/.5

             x = 27, Marla' age,  Grandma is = 81

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Marla's Grandma is currently 3 times older than Marla, but 25 years
from now Marla will be half her Grandma's age. How old is the
Grandma right now?
=======================================
Now, G = 4M
In 25 years:
G + 25 = 2*(M + 25)
Sub for G
4M + 25 = 2M + 50
2M = 25
M = 12.5
G = 50 now
-------------------------
It's a non-integer answer, because 3 times older is not 3 times as old.
3 times older = 4 times as old.
---
1 times older = 2x as old. If 1x older = 1x as old, then it's not older.
Or,
1 times older = a 100% increase, right? --> 2x as old